Anode active material, method for producing anode active material and lithium ion battery

Abstract

A main object of the present disclosure is to provide an anode active material having excellent electron conductivity and ion conductivity. The present disclosure achieves the object by providing an anode active material to be used for a lithium ion battery, the anode active material including at least a Sr element and a S element, and a Perovskite type of crystal phase belonging to a space group of I4/mmm, and a molar ratio of the S element with respect to the Sr element is larger than 0.1.

The invention claimed is: 
     
       1. A vehicle comprising a lithium ion battery including a cathode active material layer containing a cathode active material, an anode active material layer containing an anode active material, and an electrolyte layer formed between the cathode active material layer and the anode active material layer; wherein
 the anode active material comprises: 
 a composition represented by (Sr 1−x M 1   x ) a M 2   b (O 1−y S y+α ) c , wherein M 1  is at least one of Nb, Zr, Mn, Sn, and Mo, M 2  is at least one of Fe and Ti, a is 1.5 or more and 2.5 or less, b is 1.5 or more and 2.5 or less, c is 5.5 or more and 6.5 or less, x is 0.2 or more and less than 1, y is 0.05 or more and 1.00 or less, and α is 0 or more and 0.40 or less; and 
 a Perovskite type of crystal phase belonging to a space group of I4/mmm as a main phase; 
 wherein a molar ratio of the S element with respect to the Sr element is larger than 0.1. 
 
     
     
       2. The vehicle according to  claim 1 , wherein the molar ratio is 1.5 or more. 
     
     
       3. The vehicle according to  claim 1 , wherein the lithium ion battery is an all solid lithium ion battery. 
     
     
       4. The vehicle according to  claim 1 , wherein the anode active material layer contains neither a conductive material nor a solid electrolyte. 
     
     
       5. The vehicle according to  claim 1 , wherein the composition of the anode active material is represented by Sr 1.2 Nb 0.8 Fe 1.6 Ti 0.4 O 5.2 S 2 , SrZrFe 1.6 Ti 0.4 O 4.2+x S 2 , where 0≤x≤1 is satisfied, SrMnFe 1.6 Ti 0.4 O 5.2 S 2 , or Sr 1.3 Mo 0.7 Fe 1.6 Ti 0.4 O 5.2 S 2 .